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          <h1 class="post-title" itemprop="name headline">【实战篇——第三章】Vue2.5入门到实战开发去哪儿网App——Vue基础知识进阶</h1>
        

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        <p>本专题为Vue2.5的入门和实战的视频学习笔记，学习视频来自：<br>入门视频：《vue2.5入门》 <a href="http://www.imooc.com/learn/980" target="_blank" rel="noopener">http://www.imooc.com/learn/980</a><br>实战视频：《Vue2.5开发去哪儿网App 从零基础入门到实战项目》 <a href="https://coding.imooc.com/class/chapter/203.html" target="_blank" rel="noopener">https://coding.imooc.com/class/chapter/203.html</a></p>
<p>本文为实战篇的第三章，主要讲解Vue基础知识进阶</p>
<p>本文对应官网文档地址：<a href="https://cn.vuejs.org/v2/guide/" target="_blank" rel="noopener">https://cn.vuejs.org/v2/guide/</a></p>
<a id="more"></a>

<h2 id="Vue实例"><a href="#Vue实例" class="headerlink" title="Vue实例"></a>Vue实例</h2><blockquote>
<p><strong>每一个Vue组件都是一个Vue实例</strong><br><strong>一个Vue项目是由众多Vue实例嵌套组成的,但只有一个根实例: 即一个 Vue 应用由一个通过 new Vue({}) 创建的根 Vue 实例，以及可选的嵌套的、可复用的组件树组成。</strong></p>
</blockquote>
<ol>
<li>创建Vue实例</li>
<li>Vue实例绑定到元素</li>
<li>元素绑定事件</li>
<li>在元素中显示数据</li>
</ol>
<p>代码见：<a href="https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/#创建第一个Vue实例">https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/#创建第一个Vue实例</a></p>
<p>Vue实例的属性和方法示例如下：</p>
<blockquote>
<p>Vue 实例还暴露了一些有用的实例属性与实例方法。它们都有前缀 $</p>
</blockquote>
<p><img src="/blog/images/20190923172150991.jpg" alt="vue实例"></p>
<h2 id="Vue实例生命周期"><a href="#Vue实例生命周期" class="headerlink" title="Vue实例生命周期"></a>Vue实例生命周期</h2><blockquote>
<p>Vue实例生命周期钩子 === Vue实例生命周期函数<br>生命周期(钩子)函数: 就是Vue实例在某一个时间点会自动执行的函数</p>
</blockquote>
<p>Vue实例生命周期图见：<br><img src="/blog/images/lifecycle.png" alt="Vue实例生命周期"><br>图片地址：<a href="https://cn.vuejs.org/v2/guide/instance.html#%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F%E5%9B%BE%E7%A4%BA" target="_blank" rel="noopener">https://cn.vuejs.org/v2/guide/instance.html#%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F%E5%9B%BE%E7%A4%BA</a></p>
<blockquote>
<p>将el外部的html作为template编译  ===&gt; 即将el内的所有html作为一个template </p>
</blockquote>
<p>模板与数据结合，挂载到页面进行渲染之前要执行beforeMount()函数; 挂载到页面进行渲染之后，要执行mount()函数;<br><img src="/blog/images/20190923174901380.jpg" alt="页面渲染"></p>
<h2 id="Vue的模板语法——插值表达式"><a href="#Vue的模板语法——插值表达式" class="headerlink" title="Vue的模板语法——插值表达式"></a>Vue的模板语法——插值表达式</h2><figure class="highlight applescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&#123;&#123;&#125;&#125;、v-<span class="built_in">text</span>、v-html</span><br></pre></td></tr></table></figure>

<p>代码见：<br><a href="https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/#Vue实例中的数据,事件和方法">https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/#Vue实例中的数据,事件和方法</a><br><a href="https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/#Vue中的属性绑定和双向数据绑定">https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/#Vue中的属性绑定和双向数据绑定</a></p>
<p><strong>注意：vue指令后跟的字符串是JS表达式,如</strong></p>
<figure class="highlight applescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;<span class="keyword">div</span> v-bind:<span class="built_in">id</span>=<span class="string">"'list-' + id"</span>&gt;&lt;/<span class="keyword">div</span>&gt;</span><br></pre></td></tr></table></figure>

<h2 id="计算属性、方法和侦听器"><a href="#计算属性、方法和侦听器" class="headerlink" title="计算属性、方法和侦听器"></a>计算属性、方法和侦听器</h2><p>实现fullname的三种方式：</p>
<ol>
<li>计算属性：某个属性是通过其他数据或属性计算得到的，这个属性就称为计算属性；<blockquote>
<p>计算属性定义在computed属性中；<br>计算属性的一个重要作用：内置缓存机制，性能更高————当依赖的属性没有发生变化时，使用上一次计算的结果；只有当依赖的属性发生变化后，才重新计算</p>
</blockquote>
</li>
</ol>
<p><img src="/blog/images/20190924055018104.jpg" alt="计算属性"></p>
<ol start="2">
<li>侦听器: 监听某一个data属性或计算属性的数据的变化。一旦变化就触发对应的方法<blockquote>
<p>侦听器定义在watch属性中; 也有缓存机制</p>
</blockquote>
</li>
</ol>
<p><img src="/blog/images/20191011143051737.jpg" alt="侦听器"><br>代码见： <a href="https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/#Vue中的计算属性和侦听器">https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/#Vue中的计算属性和侦听器</a></p>
<blockquote>
<ol start="3">
<li>方法<br>方法定义在methods属性中。但这种方式没有缓存机制</li>
</ol>
</blockquote>
<p><img src="/blog/images/20190924055222505.jpg" alt="方法"></p>
<p>总结：上述三种方式都能实现一个功能的情况下，优先使用computed，因为这种性能最高</p>
<h2 id="计算属性的-getter-和-setter"><a href="#计算属性的-getter-和-setter" class="headerlink" title="计算属性的 getter 和 setter"></a>计算属性的 getter 和 setter</h2><blockquote>
<p>设置了setter方法后，当依赖的属性没有发生变化时，使用上一次计算的结果；只有当依赖的属性发生变化后，计算属性则重新计算————缓存机制</p>
</blockquote>
<p><img src="/blog/images/20190924060541877.jpg" alt="计算属性"></p>
<h2 id="Vue中的样式绑定"><a href="#Vue中的样式绑定" class="headerlink" title="Vue中的样式绑定"></a>Vue中的样式绑定</h2><blockquote>
<p>给Dom绑定样式的两种方式: 绑定对象、绑定数组</p>
</blockquote>
<ol>
<li><p>class的对象绑定</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">//class的对象绑定 ：class="&#123;activated: isActivated&#125;</span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">style</span>&gt;</span></span><br><span class="line"><span class="css">   <span class="selector-class">.activated</span>&#123;<span class="attribute">color</span>:red&#125;   </span></span><br><span class="line"><span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">'app'</span>&gt;</span></span><br><span class="line">   <span class="comment">&lt;!-- 设置div的class为activated，但这个class是否显示取决于isActivated --&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">div</span> @<span class="attr">click</span>=<span class="string">"handleDivClick"</span> ：<span class="attr">class</span>=<span class="string">"&#123;activated: isActivated&#125;"</span>&gt;</span>Hello world<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="actionscript">   <span class="keyword">var</span> vm = <span class="keyword">new</span> Vue(&#123;</span></span><br><span class="line"><span class="actionscript">      el: <span class="string">'#app'</span>,</span></span><br><span class="line">      data: &#123;</span><br><span class="line"><span class="actionscript">      	isActivated: <span class="literal">false</span></span></span><br><span class="line">      &#125;,</span><br><span class="line">      methods: &#123;</span><br><span class="line"><span class="actionscript">      	handleDivClick: <span class="function"><span class="keyword">function</span><span class="params">()</span></span>&#123;</span></span><br><span class="line"><span class="actionscript">      		<span class="comment">//取反</span></span></span><br><span class="line"><span class="actionscript">      		<span class="keyword">this</span>.isActivated = ！<span class="keyword">this</span>.isActivated</span></span><br><span class="line">      	&#125;</span><br><span class="line">      &#125;</span><br><span class="line">   &#125;)</span><br><span class="line"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>class的数组绑定，可以绑定多个class</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line">//class的数组绑定 ：class="[activated]</span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">style</span>&gt;</span></span><br><span class="line"><span class="css">  <span class="selector-class">.activated</span>&#123;<span class="attribute">color</span>:red&#125;   </span></span><br><span class="line"><span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">'app'</span>&gt;</span></span><br><span class="line">   <span class="comment">&lt;!-- 设置div的class为activated变量的值 --&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">div</span> @<span class="attr">click</span>=<span class="string">"handleDivClick"</span> ：<span class="attr">class</span>=<span class="string">"[activated]"</span>&gt;</span>Hello world<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="actionscript">   <span class="keyword">var</span> vm = <span class="keyword">new</span> Vue(&#123;</span></span><br><span class="line"><span class="actionscript">      el: <span class="string">'#app'</span>,</span></span><br><span class="line">      data: &#123;</span><br><span class="line"><span class="actionscript">      	activated: <span class="string">''</span></span></span><br><span class="line">      &#125;,</span><br><span class="line">      methods: &#123;</span><br><span class="line"><span class="actionscript">      	handleDivClick: <span class="function"><span class="keyword">function</span><span class="params">()</span></span>&#123;</span></span><br><span class="line"><span class="actionscript">      		<span class="keyword">this</span>.activated = (<span class="keyword">this</span>.activated===<span class="string">'activated'</span>?<span class="string">''</span>:<span class="string">'activated'</span>)</span></span><br><span class="line">      	&#125;</span><br><span class="line">      &#125;</span><br><span class="line">   &#125;)</span><br><span class="line"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>style的对象绑定</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">'app'</span>&gt;</span></span><br><span class="line">   <span class="comment">&lt;!-- 设置div的style为对象styleObj --&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">div</span> @<span class="attr">click</span>=<span class="string">"handleDivClick"</span> <span class="attr">:style</span>=<span class="string">"styleObj"</span>&gt;</span>Hello world<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="actionscript">   <span class="keyword">var</span> vm = <span class="keyword">new</span> Vue(&#123;</span></span><br><span class="line"><span class="actionscript">      el: <span class="string">'#app'</span>,</span></span><br><span class="line">      data: &#123;</span><br><span class="line">      	styleObj: &#123;</span><br><span class="line"><span class="actionscript">      		color: <span class="string">'red'</span></span></span><br><span class="line">      	&#125;</span><br><span class="line">      &#125;,</span><br><span class="line">      methods: &#123;</span><br><span class="line"><span class="actionscript">      	handleDivClick: <span class="function"><span class="keyword">function</span><span class="params">()</span></span>&#123;</span></span><br><span class="line"><span class="actionscript">      		<span class="keyword">this</span>.styleObj = (<span class="keyword">this</span>.styleObj === <span class="string">'red'</span>?<span class="string">'black'</span>:<span class="string">'red'</span>)</span></span><br><span class="line">      	&#125;</span><br><span class="line">      &#125;</span><br><span class="line">   &#125;)</span><br><span class="line"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>style的数组绑定，，可以绑定多个style对象</p>
<figure class="highlight dust"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="xml"><span class="comment">&lt;!-- 设置div的style由styleObj对象决定 --&gt;</span></span></span><br><span class="line"><span class="xml"><span class="tag">&lt;<span class="name">div</span> @<span class="attr">click</span>=<span class="string">"handleDivClick"</span> <span class="attr">:style</span>=<span class="string">"[styleObj, </span></span></span><span class="template-variable">&#123;fontSize: '20px'&#125;</span><span class="xml"><span class="tag"><span class="string">]"</span>&gt;</span>Hello world<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br></pre></td></tr></table></figure>

</li>
</ol>
<p>上述四种样式的绑定效果如下：<br><img src="/blog/images/20190924061538340.jpg" alt="样式绑定"></p>
<h2 id="Vue中的条件渲染"><a href="#Vue中的条件渲染" class="headerlink" title="Vue中的条件渲染"></a>Vue中的条件渲染</h2><ol>
<li><p>v-if指令：控制dom元素的存在与否————条件为true则新增该dom元素，false则删除该元素。</p>
<blockquote>
<p>该指令会直接将dom元素从挂载点中删除或新增</p>
</blockquote>
</li>
<li><p>v-show指令：控制dom元素的显示与否————条件为true则显示该dom元素，false则隐私该元素。</p>
<blockquote>
<p>该指令会将dom元素通过display:none来显示或隐藏; v-show指令与v-if指令显示效果相同，但实现原理不同; v-show的性能更高</p>
</blockquote>
</li>
</ol>
<p>代码见：<a href="https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/">https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/</a></p>
<p><img src="/blog/images/20190924063623284.jpg" alt="条件渲染"></p>
<ol start="3">
<li>v-else指令<blockquote>
<p>注意： v-if和v-else指令必须相邻，否则浏览器会报错</p>
</blockquote>
</li>
</ol>
<p><img src="/blog/images/20190924063818788.jpg" alt="v-else指令"></p>
<ol start="4">
<li><p>v-else-if指令<br><img src="/blog/images/20190924064055506.jpg" alt="v-else-if指令"></p>
</li>
<li><p>通过key属性清空元素的历史数据：</p>
<blockquote>
<p>通过key属性标识元素的唯一性，避免Vue复用该DOM结构造成历史数据的保留</p>
</blockquote>
</li>
</ol>
<p><img src="/blog/images/20190924064632971.jpg" alt="清空元素内容的解决方法"></p>
<h2 id="Vue中的列表渲染"><a href="#Vue中的列表渲染" class="headerlink" title="Vue中的列表渲染"></a>Vue中的列表渲染</h2><blockquote>
<p>v-for指令: 循环展示数据；同时最好使用key属性可以提升循环的性能</p>
</blockquote>
<p>代码见：<a href="https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/">https://aiolos123.gitee.io/blog/2019/09/20/vue-learning-step-by-step-1/</a></p>
<h3 id="列表渲染的细节"><a href="#列表渲染的细节" class="headerlink" title="列表渲染的细节"></a>列表渲染的细节</h3><ol>
<li>为了提示循环显示的性能，一般都要在循环项上加一个唯一的key值————(通过:key属性)<blockquote>
<p>但不推荐使用index作为key值。因为频繁操作Dom元素对应的数据时Vue无法复用Dom节点，也比较消耗性能<br>推荐使用数据唯一的id来作为key值。如下代码：</p>
</blockquote>
</li>
</ol>
<figure class="highlight vim"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">&lt;div v-<span class="keyword">for</span>=<span class="string">"(item, index) of list"</span> :key=<span class="string">"item.id"</span>&gt;&#123;&#123; item.text &#125;&#125;&lt;/div&gt;</span><br><span class="line">var <span class="keyword">vm</span> = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">	dat<span class="variable">a:</span> &#123;</span><br><span class="line">	   lis<span class="variable">t:</span> [</span><br><span class="line">          &#123;</span><br><span class="line">      	    id:<span class="string">'1043435623'</span>,</span><br><span class="line">      	    tex<span class="variable">t:</span> <span class="string">'hello'</span></span><br><span class="line">          &#125;,</span><br><span class="line">          &#123;</span><br><span class="line">          	id:<span class="string">'1043435624'</span>,</span><br><span class="line">          	tex<span class="variable">t:</span> <span class="string">'world'</span></span><br><span class="line">          &#125;,</span><br><span class="line">          &#123;</span><br><span class="line">            id:<span class="string">'1043435625'</span>,</span><br><span class="line">      	    tex<span class="variable">t:</span> <span class="string">'dello'</span></span><br><span class="line">          &#125;,</span><br><span class="line">	    ]</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<ol start="2">
<li>动态改变list值，页面实时变化<figure class="highlight vim"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"># 正确添加方式</span><br><span class="line"><span class="keyword">vm</span>.<span class="keyword">list</span>.push(&#123;id:<span class="string">'4395322'</span>,tex<span class="variable">t:</span><span class="string">'hotel'</span>&#125;)</span><br><span class="line"></span><br><span class="line"># 错误添加方式</span><br><span class="line"><span class="keyword">vm</span>.<span class="keyword">list</span>[<span class="number">3</span>] = &#123;id:<span class="string">'4395322'</span>,tex<span class="variable">t:</span><span class="string">'hotel'</span>&#125;</span><br></pre></td></tr></table></figure>

</li>
</ol>
<p><strong>结论：</strong></p>
<blockquote>
<p>在Vue中，通过下标修改数组后，无法将数组的数据变化实时显示到页面上，<br>只能通过Vue提供的数组方法来操作数组，才能实现实时显示到页面的效果，<br>这些方法有七个：pop、push、shift、unshift、splice、sort、reservse</p>
</blockquote>
<p>通过数组方法修改数组，数据可以实时显示到页面如下图：<br><img src="/blog/images/20191011145759271.jpg" alt="通过数组方法修改数组"></p>
<p>通过下标修改数组，数据无法实时显示到页面如下图：<br><img src="/blog/images/20190924101040412.jpg" alt="通过下标修改数组"></p>
<blockquote>
<p>通过改变数组引用，也可以实现改变数组后，页面实时改变</p>
</blockquote>
<p><img src="/blog/images/20190924101807560.jpg" alt="通过改变数组引用"></p>
<ol start="3">
<li>两次使用同一个循环<blockquote>
<p>template标签：类似于一个容器占位符，不会出现在页面的dom结构中</p>
</blockquote>
</li>
</ol>
<p><img src="/blog/images/20190924102039501.jpg" alt="两次使用同一个循环"></p>
<ol start="4">
<li>循环对象</li>
</ol>
<p><img src="/blog/images/20190924102548419.jpg" alt="循环对象"></p>
<p>动态改变对象中的值，可以实时显示到页面上；<br>动态向对象中添加值，无法实时显示到页面上，只有通过改变引用的方式能实时显示到页面上：<br><img src="/blog/images/20190924103034100.jpg" alt="动态改变对象中的值"></p>
<h2 id="Vue中的set方法"><a href="#Vue中的set方法" class="headerlink" title="Vue中的set方法"></a>Vue中的set方法</h2><ol>
<li>通过set方法动态向对象中添加值————通过Vue.set方法,也能实现实时显示到页面上</li>
</ol>
<p><img src="/blog/images/20190924103416950.jpg" alt="通过set方法动态向对象中添加值"></p>
<ol start="2">
<li><p>通过set方法动态向对象中添加值————通过vm.$set方法,也能实现实时显示到页面上<br><img src="/blog/images/20190924103543420.jpg" alt="通过set方法动态向对象中添加值"></p>
</li>
<li><p>通过set方法动态修改数组中的值————通过Vue.set方法,也能实现实时显示到页面上</p>
</li>
<li><p>通过set方法动态修改数组中的值————通过vm.$set方法,也能实现实时显示到页面上<br><img src="/blog/images/20190924103953966.jpg" alt="通过set方法动态修改数组中的值"></p>
</li>
</ol>
<h2 id="小结"><a href="#小结" class="headerlink" title="小结"></a>小结</h2><ol>
<li><p>Vue中实现改变数组中的数据，页面实时变化的方式由三种：改变数组的引用、调用数组方法、Vue的set方法</p>
</li>
<li><p>Vue中实现改变对象中的数据，页面实时变化的方式由二种：改变对象的引用、Vue的set方法</p>
</li>
</ol>

      
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